Download - CMS 45' Slides by Joseph Incandela
Status of the CMS SM Higgs Search
Joe Incandela UCSB/CERN July 4, 2012
1
Status of the CMS SM Higgs Search
Joe Incandela UCSB/CERN July 4, 2012
Raw ΣET~2 TeV 14 jets with ET>40 Estimated PU~50
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On behalf of the CMS Collaboration
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The Standard Model
4
Measurement Fit |Omeas
!Ofit|/"
meas
0 1 2 3
0 1 2 3
#$had(mZ)#$(5)
0.02758 ± 0.00035 0.02768
mZ [GeV]mZ [GeV] 91.1875 ± 0.0021 91.1874
%Z [GeV]%Z [GeV] 2.4952 ± 0.0023 2.4959
"had [nb]"0
41.540 ± 0.037 41.479
RlRl 20.767 ± 0.025 20.742
AfbA0,l
0.01714 ± 0.00095 0.01645
Al(P&)Al(P&) 0.1465 ± 0.0032 0.1481
RbRb 0.21629 ± 0.00066 0.21579
RcRc 0.1721 ± 0.0030 0.1723
AfbA0,b
0.0992 ± 0.0016 0.1038
AfbA0,c
0.0707 ± 0.0035 0.0742
AbAb 0.923 ± 0.020 0.935
AcAc 0.670 ± 0.027 0.668
Al(SLD)Al(SLD) 0.1513 ± 0.0021 0.1481
sin2'effsin
2'
lept(Qfb) 0.2324 ± 0.0012 0.2314
mW [GeV]mW [GeV] 80.399 ± 0.023 80.379
%W [GeV]%W [GeV] 2.085 ± 0.042 2.092
mt [GeV]mt [GeV] 173.3 ± 1.1 173.4
July 2010
The Standard Model
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Measurement Fit |Omeas
!Ofit|/"
meas
0 1 2 3
0 1 2 3
#$had(mZ)#$(5)
0.02758 ± 0.00035 0.02768
mZ [GeV]mZ [GeV] 91.1875 ± 0.0021 91.1874
%Z [GeV]%Z [GeV] 2.4952 ± 0.0023 2.4959
"had [nb]"0
41.540 ± 0.037 41.479
RlRl 20.767 ± 0.025 20.742
AfbA0,l
0.01714 ± 0.00095 0.01645
Al(P&)Al(P&) 0.1465 ± 0.0032 0.1481
RbRb 0.21629 ± 0.00066 0.21579
RcRc 0.1721 ± 0.0030 0.1723
AfbA0,b
0.0992 ± 0.0016 0.1038
AfbA0,c
0.0707 ± 0.0035 0.0742
AbAb 0.923 ± 0.020 0.935
AcAc 0.670 ± 0.027 0.668
Al(SLD)Al(SLD) 0.1513 ± 0.0021 0.1481
sin2'effsin
2'
lept(Qfb) 0.2324 ± 0.0012 0.2314
mW [GeV]mW [GeV] 80.399 ± 0.023 80.379
%W [GeV]%W [GeV] 2.085 ± 0.042 2.092
mt [GeV]mt [GeV] 173.3 ± 1.1 173.4
July 2010
The Standard Model
Confirmed to better than 1 % uncertainty by 100’s of precision measurements
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Measurement Fit |Omeas
!Ofit|/"
meas
0 1 2 3
0 1 2 3
#$had(mZ)#$(5)
0.02758 ± 0.00035 0.02768
mZ [GeV]mZ [GeV] 91.1875 ± 0.0021 91.1874
%Z [GeV]%Z [GeV] 2.4952 ± 0.0023 2.4959
"had [nb]"0
41.540 ± 0.037 41.479
RlRl 20.767 ± 0.025 20.742
AfbA0,l
0.01714 ± 0.00095 0.01645
Al(P&)Al(P&) 0.1465 ± 0.0032 0.1481
RbRb 0.21629 ± 0.00066 0.21579
RcRc 0.1721 ± 0.0030 0.1723
AfbA0,b
0.0992 ± 0.0016 0.1038
AfbA0,c
0.0707 ± 0.0035 0.0742
AbAb 0.923 ± 0.020 0.935
AcAc 0.670 ± 0.027 0.668
Al(SLD)Al(SLD) 0.1513 ± 0.0021 0.1481
sin2'effsin
2'
lept(Qfb) 0.2324 ± 0.0012 0.2314
mW [GeV]mW [GeV] 80.399 ± 0.023 80.379
%W [GeV]%W [GeV] 2.085 ± 0.042 2.092
mt [GeV]mt [GeV] 173.3 ± 1.1 173.4
July 2010
The Standard Model
Confirmed to better than 1 % uncertainty by 100’s of precision measurements
1 Missing piece: Higgs
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Measurement Fit |Omeas
!Ofit|/"
meas
0 1 2 3
0 1 2 3
#$had(mZ)#$(5)
0.02758 ± 0.00035 0.02768
mZ [GeV]mZ [GeV] 91.1875 ± 0.0021 91.1874
%Z [GeV]%Z [GeV] 2.4952 ± 0.0023 2.4959
"had [nb]"0
41.540 ± 0.037 41.479
RlRl 20.767 ± 0.025 20.742
AfbA0,l
0.01714 ± 0.00095 0.01645
Al(P&)Al(P&) 0.1465 ± 0.0032 0.1481
RbRb 0.21629 ± 0.00066 0.21579
RcRc 0.1721 ± 0.0030 0.1723
AfbA0,b
0.0992 ± 0.0016 0.1038
AfbA0,c
0.0707 ± 0.0035 0.0742
AbAb 0.923 ± 0.020 0.935
AcAc 0.670 ± 0.027 0.668
Al(SLD)Al(SLD) 0.1513 ± 0.0021 0.1481
sin2'effsin
2'
lept(Qfb) 0.2324 ± 0.0012 0.2314
mW [GeV]mW [GeV] 80.399 ± 0.023 80.379
%W [GeV]%W [GeV] 2.085 ± 0.042 2.092
mt [GeV]mt [GeV] 173.3 ± 1.1 173.4
July 2010
The Standard Model
Confirmed to better than 1 % uncertainty by 100’s of precision measurements
1 Missing piece: Higgs
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Where we stood last week 1. Mtopvs. MW
§ Tevatron MW Tour de Force!! mW = 80385 ± 15 MeV ( World Ave – Mar 2012)
§ Shifts for SM Higgs expectation
2. Colliders leave little space
This is the main story of the past year
Eliminated ~475 GeV of the mass range.
9 9
~Mt2
~ln(mH)
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Higgs boson production
§ √s=8 TeV: 25-‐30% higher σ than √s=7 TeV at low mH
§ All production modes to be exploited § gg VBF VH ttH § Latter 3 have smaller cross sections but better S/B in many cases
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Higgs boson production
§ √s=8 TeV: 25-‐30% higher σ than √s=7 TeV at low mH
§ All production modes to be exploited § gg VBF VH ttH § Latter 3 have smaller cross sections but better S/B in many cases
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Higgs boson decays
5 decay modes exploited
§ High mass: WW, ZZ
§ Low mass: bb, ττ, WW, ZZ, γγ
§ Low mass region is very rich but also very challenging: main decay modes (bb, ττ) are hard to identify in the huge background
§ Very good mass resolution (1%): Hàγγ and HàZZà4l
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§ Not-‐yet-‐excluded region: ~[115-‐130] GeV
§ The five decay modes discussed today have comparable sensitivities for exclusion.
§ Most analyses used in this combination have been re-‐optimized. In order to avoid the possibility of an unintended bias, all selection criteria in the analyses of the 2011 and 2012 data were fixed before looking at the result in the signal region.
CMS Exclusion Potential
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p-‐values § Probability that background fluctuates to give an excess as large as the (average) signal size expected for a SM Higgs. Takes into account all analysis steps, estimated backgrounds, etc. for the 5 search channels indicated.
§ Excellent prospects for exploring properties
CMS Discovery potential
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How is it possible to go so far so fast? LHC performance: 2010-‐2011-‐2012
Time in year02/05 02/07 01/09
)-1To
tal In
tegr
ated
Lum
inos
ity (f
b
0
1
2
3
4
5
6
7
= 7 TeVs2010, = 7 TeVs2011, = 8 TeVs2012,
CMS Total Integrated Luminosity, p-p
0
1
2
3
4
5
6
7 Stellar performance of the LHC enables all experiments to produce significant physics results
Many thanks to the LHC teams and the many others who made this possible!
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2012 certified ‘Golden’: 5.19 m-‐1 (85%) Muon: 5.62 m-‐1 (92%)
CMS 3.8T Solenoid
ECAL 76k scintillating PbWO4 crystals HCAL Scintillator/brass
Interleaved ~7k ch
• Pixels (100x150 µm2) " ~ 1 m2 ~66M ch"• Si Strips (80-180 µm)" ~200 m2 ~9.6M ch
Pixels & Tracker
MUON BARREL 250 Drift Tubes (DT) and 480 Resistive Plate Chambers (RPC)
473 Cathode Strip Chambers (CSC) 432 Resistive Plate Chambers (RPC)
MUON ENDCAPS
Total weight 14000 t Overall diameter 15 m Overall length 28.7 m
IRON YOKE
YBO YB1-2
Preshower Si Strips ~16 m2
~137k ch
Foward Cal Steel + quartz Fibers 2~k ch
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Current Operational Status*
0 10 20 30 40 50 60 70 80 90 100
muon CSC muon DT
muon RPC HCAL Barrel
HCAL Endcap HCAL Forward
HCAL Outer ECAL Barrel
ECAL Endcap Preshower
Strips Pixels
Pixel Tracker
Strip Tracker
Preshower ECAL Barrel
ECAL Endcaps
HCAL Barrel
HCAL Endcaps
HCAL Forward
HCAL Outer
Muon DT
Muon CSC
Muon RPC
97.1% 97.75% 97.1% 99.16% 98.54% 99.92% 99.96% 99.88% 96.88% 99.1% 97.67% 98.2%
*As of June 15 2012 17
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§ Weν E/p: Stable E scale during 2012 run after light monitoring (LM) corrections: § ECAL Barrel (EB): RMS stability after corrections 0.19%
§ Zàee: Good resolution with preliminary energy calibration for 2012: Instrumental resolution: 1.0 GeV in ECAL Barrel
ECAL calibration, 2012 data
date (day/month)12/04 19/04 26/04 03/05 10/05 17/05 24/05 31/05 07/06
Rela
tive
E/p
scal
e
0.930.940.950.960.970.980.99
11.011.021.03
with LM correctionwithout LM correction1 / LM correction
CMS 2012 Preliminary-1 = 8 TeV L = 3.95 fbs
ECAL Barrel: Prompt Reco
Mean 1RMS 0.0019
0 50 100
Mean 1RMS 0.0019Mean 0.97RMS 0.0063
Single electron energy scale (E/p) stability in barrel measured with W eν events
Zee invariant mass distribution for electrons measured in the barrel
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EB: Prompt Reconstruction!!
Electrons with low or no Bremsstrahlung
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CMS Preparations for 8 TeV and high PU in 2012
§ Last Autumn § cpu time for high PU >40 sec/event § Memory usage well above 2 GB. Means we cannot use all the cores!
§ Even 200 Hz looked hard! § Task force started December
§ Major success! § Improvements
§ A factor 2.5 in speed Under ~15” per event on average
§ Much reduced memory use Well under 2 GB
§ Physics performance unchanged § Kept our AAA rating: E.g. no explicit pT threshold on tracks
Jan 12
Tier-0 Capacity
! If we assume a 50% keep up factor in the Tier-0 and 90% processing efficiency
! Reasonably optimistic and leaves little room for catching up
3
0
150
300
450
600
20 30 40 50 60 70
Pro
mpt
Rec
o (
Hz)
Time Per Event (s)
2GB/core 3GB/core! With 40% machine
live time this leaves 20% contingency
! This assumes we have and keep most of lxbatch
Prompt Reconstruction at Tier-‐0: Limit on our data-‐taking rate versus event processing time for low and high memory use cases
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MC Production Capabilities
§ GEN-‐SIM @ Tier-‐2’s § Sustain 400M/Month 900M, 600M past 2 months but had help from Tier-‐1’s
§ Redigi-‐Rereco@ Tier-‐1’s § Sustain 1B/month Peaks high as 2.3B
GEN-SIM/AODSIM Production/Month
5
GEN-‐SIM
Redigi-‐Rereco
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Reconstruction!
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§ Optimal combination of information from all subdetectors § Returns a list of reconstructed particles § e,μ,γ, charged and neutral hadrons Used in the analysis as if it came from a list of generated particles Used as building blocks for jets, taus , missing transverse energy , isolation and PU particle identification
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Global Event Description (Pflow) Made possible by CMS granularity and high magnetic field
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§ Cluster reconstruction in ECAL § Common for both electrons and photons (Electrons also reconstructed as photons) § Designed to collect bremsstrahlung and conversions in extended phi region
§ Dedicated track reconstruction for electrons § Gaussian Sum Filter allows for tracks w/large bremsstrahlung
§ Photon identification specific to Hèϒϒ § Energy scale and resolution
§ Extensive control with Z and J/ψèee for both electrons and photons
Electron/Photon reconstruction
Electrons ECAL Barrel (EB)
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Electron identification § Multivariate e identification in 2012 § ECAL, tracker, ECAL-‐tracker-‐HCAL matching,impact parameter § 30% efficiency improvement in H→ZZ→4e wrt cut based ID
§ Multivariate training against background in data
η variance ECAL Barrel (EB) pT<20 GeV
Cut Based vs MVA ID
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Muon reconstruction and identification
§ Start with particle flow muons § Efficiency above 96% down to pT = 5 GeV § Above 99% efficiency for pT > 10 GeV § Efficiency in data using J/Ψ and Z peak
J/Ψ→µµ Tag&Probe
Z→µµ Tag&Probe Efficiency is stable in high
PU environment
Tighter quality criteria applied in some analyses
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Particle-‐based isolation Sum energy of particles in ΔR cone around the lepton
• Global event description eliminates double counting
Endcaps pT < 10 GeV
Pile-‐up contribution: • Negligible for charged hadrons (vertexing) • Neutrals corrected w/global energy density (ρ)
Detector vs Particle Flow
ELECTRONS
MUONS
Efficiency is stable in high PU environment
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Detector Isolation Particle Flow Isolation
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Tau ID + Isolation efficiency
§ Tau identification: § Reconstruct individual decay modes § Charged hadrons + electromagnetic obj
§ EM strips account for material effects
§ Tau isolation: § Multivariate discriminator using sum of
energy deposits in dR rings around the tau
Real taus Fake taus
1 Prong 3 Prong 1 Prong + Strip
Tau Identification τ-‐> πν τ-‐> a1ν τ-‐> ρν
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Typical jet Pileup jet § Pileup jets structure differs wrt regular jets:
§ Pileup jets originate from several overlapping jets which merge together § Likelihood grows rapidly with high pileup
§ Discriminant exploits shape and tracking variables § discrimination both inside and outside tracker acceptance
Jet Identification
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• Jet reconstruction • Reconstruction with particle flow objects
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Standard Model: Precision Jets, W, and γ*/Z
Inclusive jet and dijets. 2-‐4% JES. Constrains gluon PDF up to x=0.6
Differential Drell-‐Yan cross section: 2.5M µµ pairs tests NNLO cross sections and PDFs
CMS-PAS-QCD-11-004 CMS-PAS-EWK-11-007 29 29
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[p
b]
tot
!P
roduction C
ross S
ection,
-110
1
10
210
310
410
510
CMS
W
1j"
2j"
3j"
4j"
Z
1j"
2j"
3j"
4j"
> 30 GeV jet
TE
| < 2.4 jet#|
$W
> 10 GeV$
TE
,l) > 0.7$R(%
$Z
WWWZ
ZZ
ZZ&
(127)H
-136 pb -136 pb -11.1 fb -14.7 fb
JHEP10(2011)132
CMS-PAS-EWK-10-012PLB701(2011)535 CMS-PAS-EWK-11-010 CMS-PAS-HIG-11-025
theory prediction
syst)'CMS measurement (stat
CMS 95%CL limit
Standard Model at 7 TeV 2010-‐2011
§ Fabulous agreement § Lots of data … on to the Higgs…
) (pb)t(tσ
0 50 100 150 200 250 300-0.5
8.8
App
rox.
NN
LO Q
CD
NLO
QC
D
+jetsµCMS e/ 7± 2936 ± 14 ±173
arXiv:1106.0902 (L=36/pb) lum)± syst. ± stat. ±(val
)µ,eµµCMS dilepton (ee, 7± 1414 ± 18 ±168
arXiv:1105.5661 (L=36/pb) lum)± syst. ± stat. ±(val
+jets+btagµCMS e/ 6± 1717 ± 9 ±150
arXiv:1108.3773 (L=36/pb) lum)± syst. ± stat. ±(val
CMS 2010 combination 6± 1717 ±154
arXiv:1108.3773 (L=36/pb) lum.)± tot. ±(val
)τµCMS dilepton ( 9± 2626 ± 24 ±149
TOP-11-006 (L=1.09/fb) lum)± syst. ± stat. ±(val
CMS all-hadronic 8± 4040 ± 20 ±136
TOP-11-007 (L=1.09/fb) lum)± syst. ± stat. ±(val
)µ,eµµCMS dilepton (ee, 8± 1616 ± 4 ±170
TOP-11-005 (L=1.14/fb) lum)± syst. ± stat. ±(val
+jets+btagµCMS e/ 7± 1212 ± 3 ±164
TOP-11-003 (L=0.8-1.09/pb) lum)± syst. ± stat. ±(val
=7 TeVsCMS Preliminary,
Theory: Langenfeld, Moch, Uwer, Phys. Rev. D80 (2009) 054009 PDF(90% C.L.) uncertainty⊗MSTW2008(N)NLO PDF, scale
30 30
H γγ
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H èγγ candidate
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H → γγ Overview
§ Main analysis is a Multi-‐Variate-‐Analysis (MVA) § MVAs for photon ID and event classification Fit mass distribution in 4 event classes based on a diphoton MVA output + 2 di-‐jet categories
§ Improvement in expected limit ~15% over cut-‐based analysis § Cross-‐checked with an alternative background model extraction: Fit output of a 2nd MVA combining diphoton MVA and mγγ using data in mass sidebands to construct the background model
§ Also cross-‐checked with a cut based analysis § Simple and robust Cut based photon ID and event classification
Fit data mass distribution in 2 rapidity x 2 shower shape =4 categories with different Signal over Background (S/B) + 2 di-‐jet categories
§ Published for 2011 data Phys.Lett. B710 (2012) 403-‐425 arXiv:1202.1487
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Search for a narrow mass peak with two isolated high Et photons
§ Blind analysis in 2012 § Re-‐reco 2011 data into
unchanged 2011 analysis
§ Background MC only used for analysis optimization, Z-‐>ee also to measure photon efficiencies and resolution with data
2012 8 TeV
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ESC corr"ESC"E5x5"
Photon Energy Scale and Resolution
§ ECAL cluster energies corrected using a MC trained multivariate regression § Improves resolution and restores flat response of energy scale versus pileup
Inputs: Raw cluster energies and positions, lateral and longitudinal shower shape variables, local shower positions w.r.t. crystal geometry, pileup estimators
§ Regression also used to provide a per photon energy resolution estimate § To measure the Energy Scale and resolution: use Z→e+e-‐
Both EB |η|<1 highR9
35
Effect of the regression on the Z-‐>ee peak
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ATIO
N
Photon ID § Photon pre-‐selection: § ETγ1/mγγ>3, ETγ2/mγγ>4 § Photon Id a bit tighter than trigger selection and MC EM enrichment filters Efficiency measured using tag and probe with Z→ee
§ Electron veto: Efficiency measured using tag and probe with Z→µµγ § MVA based photon ID discriminates photons from fakes:
§ Inputs: isolation, shower shape, per event energy density, pseudorapidity
36
Validation with Z→ee (inverted electron veto)
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The γγ Vertex Choice § Mass reconstruction
§ Depends on the correct position of the primary vertex § Interaction vertex is identified using tracks from recoiling jets and underlying event plus conversions
§ correct in ~83% of cases for pileup in 2011 sample. § correct in ~80% of cases for pileup in 2012 sample.
§ Vertex identification with a BDT § Input variables: Σpt
2, Σpt projected onto the γγ transverse direction, pt asymmetry and conversions
§ Correct vertex finding probability also estimated using a BDT
Efficiency to identify correct vertex
Data-‐MC efficiency for
Z-‐>μμ After
removing the μ tracks
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N
Diphoton MVA § Diphoton MVA trained on signal and background MC with input variables largely
independent of mγγ § Kinematics: pT and η of each photon, and cosΔφ between the 2 photons § Photon ID MVA output for each photon § per-‐event mass resolution and vertex probability
§ Encode all relevant information on signal vs background discrimination (aside from mγγ itself) into a single di-‐photon MVA output to first order independent of mγγ
38
§ Residual data-‐MC disagreement § For BG only make analysis sub-‐optimal § For signal would cause some category migration included in the systematic errors
Cat
0"
Cat
1 "
Cat
2"
Cat
3"
Cat
0"
Cat
1 "
Cat
2"
Cat
3"
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AB
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ATIO
N
Di-‐jet Tagging
Di-‐jet event with: • diphoton mass 121.9 GeV • dijet mass 1460 GeV • jet pT: 288.8 and 189.1 GeV • jet η: -‐2.022 and 1.860
§ Exclusive selection of di-‐photon events with VBF-‐like topology: § Two high pT jets with large pseudo-‐
rapidity difference and invariant mass
§ High S/B § ~80%-‐pure VBF events for large di-‐
jet invariant masses
39
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AB
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ATIO
N Analysis improvements in 2012:
§ Split di-‐jet tagged events in two categories based on Mjj and jet pT § ~15% improvement in sensitivity for dijet category § better sensitivity to separate different Higgs production modes
§ Removal of jets from pileup events § Based on the jet shape variables, tracks in jet and vertexing § Cross-‐checked using Z+jet and γ+jet events
Di-‐jet Tagging: Selection
Dijet selection cuts
40
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AB
OR
ATIO
N
7 TeV Mass Distribution in Categories
§ Background model is entirely from data.
§ Fit to mass distribution in each category with polynomial functions (3rd to 5th degree) § keep bias below 20% of fit
error. § causes some loss of
performance due to number of parameters in fit function.
Untagged 0 Untagged 1 Untagged 2
Untagged 3 Dijet tag
41
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AB
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N
8 TeV Mass Distribution in Categories
Untagged 0 Untagged 1 Untagged 2
Untagged 3 Dijet tight Dijet loose
42
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OLL
AB
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ATIO
N
S/B Weighted Mass Distribution § Sum of mass distributions for each event class, weighted by S/B
§ B is integral of background model over a constant signal fraction interval
43
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CM
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OLL
AB
OR
ATIO
N
95% CL Exclusion for SM Higgs
§ Expected 95% CL exclusion 0.76 times SM at 125 GeV § Large range with expected excusion below σSM § Largest excess at 125 GeV
44
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AB
OR
ATIO
N
P-Values
§ Minimum local p-value at 125 GeV with a local significance of 4.1 σ § Similar excess in 2011 and 2012 § Independent cross check analyses give similar results § Global significance in the full search range (110-150 GeV) 3.2 σ
45
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AB
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ATIO
N
Fitted Signal Strength
Combined best fit signal strength σ/σSM = 1.56±0.43 x SM, consistent with SM.
Best fit signal strength consistent between different classes
46
H ZZ*
47
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AB
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ATIO
N
.
H →ZZ(*) →4l (l = e,μ): the golden channel
Background: irreducible ZZ(*); reducible Z+jets, ttbar, WZ
Clean signature: narrow peak, low background
One of the best performing channels in the whole mass range … … but extremely demanding channel for
selection, requiring the highest possible efficiencies (lepton Reco/ID/Isolation).
126
Small branching ratioσ
(pp→
H→ZZ
( *)→
4l) [
fb]
12345678
0
Production cross sections
H!e e μ μ + - + -
H!e e e e
H!l l l l (l = e,μ) + - + -
+ - + -
200mH [GeV]
100 300 400 500 600
48
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AB
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ATIO
N
Blinding policy: analysis optimized blindly for 2012, applied to 2011 reoptimization
Do NOT look at 110 < m4l <140 GeV, and m4l > 300 GeV
.
2012 analysis + improvements
Expected exclusion range 121–540 GeV
Main changes:
New lepton ID (MVA + PFlow) New lepton PFlow isolation Final State Radiation (FSR) recovery 2D analysis: m4l + Kinematic Discriminant
>20% improvement @ mH = 126 GeV wrt 2011 analysis
49
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OLL
AB
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ATIO
N
Final State Radiation recovery algorithm
µ,e µ,e γ
l Applied on each Z for photons near the leptons
Expected Performance for MH=126 GeV
§ 6% of events affected § Average purity of 80% § 2% added in analysis
l Associates photon with Z if: l M(ll+γ)< 100 GeV l |M(ll+γ)-‐ΜZ|<|M(ll)-‐MZ|
l Removes associated photons from lepton isolation calculation
Z
ΔR(l, γ)min<0.5
Particle Flow ID ET> 2 GeV |η|<2.4 Isolation
50
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AB
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ATIO
N
[GeV]4lm100 200 300 400 500 600
a.u.
0
0.2
0.4
0.6
0.8Simulation (POWHEG+Pythia)
µ 2e2 ZZ qq
µShape Model, 2e2
CMS Preliminary 2012 = 7 TeVs
[GeV]4lm100 150 200 250 300 350 400 450 500 550 600
Even
ts /
10 G
eV
0
1
2
3
4
5
6
Signal Region (WFC)
irreducible (sim.): 2.6
reducible (data): 11.3
observed: 12
-1 = 7 TeV, L = 5.05 fbsCMS Preliminary
[GeV]4lm100 150 200 250 300 350 400 450 500 550 600
Even
ts /
10 G
eV
0
50
100
150
200
2502P+2F Region (PFC)
*ZZ, ZWZtt
bZ+bZ+jetsObserved eventsLandau fit
-1 = 7 TeV, L = 5.05 fbsCMS Preliminary
§ Irreducible background ZZ 4l § Estimated using simulation
§ Phenomenological shape models
§ Corrected for data/simulation scale
§ Reducible backgrounds estimated from data § Extrapolation from control samples enriched with misidentified leptons § Total uncertainty ~50%
[GeV]4lm200 400 600
a.u.
0
5
10
15
20Simulation (GG2ZZ)
µ 2e2 ZZ gg
µShape Model, 2e2
CMS Preliminary 2012 = 7 TeVs
Background models
4l 4l
qq à ZZ à 4l gg à ZZ à 4l
51
Validation in data
control sample
wrong flavors & charges
July
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AB
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ATIO
N
MELA
Matrix Element Likelihood Analysis: uses kinematic inputs for
signal to background discrimination {m1,m2,θ1,θ2,θ*,Φ,Φ1}
52
SM H(125 GeV) qqZZ
PRD81,075022(2010) http://arXiv.org/abs/arXiv:1001.5300
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AB
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ATIO
N
MELA sign
al
backgrou
nd
2D analysis using {m4l,MELA} MELA offers powerful discrimination of background
technique applicable for signal hypothesis testing
CMS simulation Higgs, 126 GeV
53
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N
54
μ-‐(Z1) pT : 24 GeV
μ+(Z1) pT : 43 GeV
e-‐(Z2) pT : 10 GeV
e+(Z2) pT : 21 GeV
8 TeV DATA 4-‐lepton Mass : 126.9 GeV
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7 TeV DATA 4μ+γ Mass : 126.1 GeV
μ-‐(Z1) pT : 28 GeV
μ+(Z2) pT : 6 GeV
μ+(Z1) pT : 67 GeV
μ-‐(Z2) pT : 14 GeV
γ(Z1) ET : 8 GeV
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N
56
7 TeV DATA 4-‐lepton Mass : 125.8 GeV
μ-‐(Z2) pT : 15 GeV
μ+(Z2) pT : 12 GeV
e+(Z1) pT : 28 GeV
e-‐(Z1) pT : 14 GeV
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AB
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Results: m(4l) spectrum
164 events expected in [100, 800 GeV] 172 events observed in [100, 800 GeV]
[GeV]4lmEv
ents
/ 3
GeV
0
2
4
6
8
10
12
[GeV]4lmEv
ents
/ 3
GeV
0
2
4
6
8
10
12 Data
Z+X
*,ZZZ
=126 GeVHm
µ, 2e2µ7 TeV 4e, 4µ, 2e2µ8 TeV 4e, 4
CMS Preliminary -1 = 8 TeV, L = 5.26 fbs ; -1 = 7 TeV, L = 5.05 fbs
[GeV]4lm80 100 120 140 160 180
Event-‐by-‐event errors 57
Yields for m(4l)=110..160 GeV
2011+2012
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Perform 2D fit § MELA discriminant versus m4l Data points shown with per-‐event mass uncertainties
Results: MELA 2D plots
Data w.r.t. background expectation
58
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Perform 2D fit § MELA discriminant versus m4l Data points shown with per-‐event mass uncertainties
Results: MELA 2D plots
59
Data w.r.t 126 GeV Higgs Expectation
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AB
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Two-‐lepton invariant mass plots
[GeV]Z1m40 50 60 70 80 90 100 110 120
Even
ts /
4 G
eV
0
1
2
3
4
5
6
7Data
Z+X
,ZZ*Z
=126 GeVHm
CMS Preliminary -1 = 8 TeV, L = 5.26 fbs ; -1 = 7 TeV, L = 5.05 fbs
[GeV]Z2m20 30 40 50 60 70 80
Even
ts /
4 G
eV
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5Data
Z+X
,ZZ*Z
=126 GeVHm
CMS Preliminary -1 = 8 TeV, L = 5.26 fbs ; -1 = 7 TeV, L = 5.05 fbs
[GeV]Z1 m40 50 60 70 80 90 100 110 120
[GeV
]Z2
m
20
40
60
80
100
120
0
10
20
30
40
50
4e µ4
µ2e2
CMS Preliminary -1 = 7 TeV, L = 5.0 fbs-1 = 8 TeV, L = 5.3 fbs
60
Grey – is simulation (expectation) for Higgs (126 GeV)
a.u.
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§ Enrich the signal content Cut: MELA > 0.5
Cut value chosen such that signal probability > background probability
For illustration: Low mass region with MELA cut
61
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OLL
AB
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ATIO
N
[GeV]Hm100 200 300 400 500 600
loca
l p-v
alue
-510
-410
-310
-210
-110
1
CMS Preliminary
-1 = 7 TeV, L = 5.05 fbs -1 = 8 TeV, L = 5.26 fbs
4L ZZ H
2D Fit 7TeV2D Fit 8TeV2D Fit 7+8TeVExpected
1
2
3
4
Limits and p-‐values
.
Expected exclusion at 95% CL : 121-‐550 GeV
Observed exclusion at 95% CL : 131-‐162 GeV and 172-‐530 GeV
Expected significance at 125.5 GeV : 3.8 σ
Observed significance at 125.5 GeV: 3.2 σ
July
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AB
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ATIO
N
Limits and p-‐values
.
[GeV]Hm110 120 130 140 150 160 170 180
loca
l p-v
alue
-510
-410
-310
-210
-110
1
CMS Preliminary
-1 = 7 TeV, L = 5.05 fbs -1 = 8 TeV, L = 5.26 fbs
4L ZZ H
1
2
3
4
2D Fit 7TeV2D Fit 8TeV2D Fit 7+8TeVExpected
Expected exclusion at 95% CL : 121-‐550 GeV
Observed exclusion at 95% CL : 131-‐162 GeV and 172-‐530 GeV
Expected significance at 125.5 GeV : 3.8 σ
Observed significance at 125.5 GeV: 3.2 σ
July
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Characterization of excess near 125 GeV
64
§ high sensitivity, high mass resolution channels: γγ+4l
§ γγ: 4.1 σ excess § 4 leptons: 3.2 σ excess § near the same mass 125 GeV
§ comb. significance: 5.0 σ
§ expected significance for SM Higgs: 4.7 σ
H WWlνlν!
65
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AB
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ATIO
N
H→WW→lνlν Signature
66
µ PT 32 GeV e PT
34 GeV
MET 47 GeV
qq→WW + gg→WW • Non-‐resonant
H→WW • Large BR • Small Δφ(ll)
Signature: 2 high pT leptons large missing ET
Main backgrounds: WW, top Other backgrounds: W+jet, Z/γ*, WZ, ZZ, Wγ
July
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Analysis Strategies
67
Split in categories • 0/1-‐jet and VBF • Final state lepton flavors Cut-‐based approach for the first 2012 result
Data-‐driven background estimation • W+jets
Fake rate measured in QCD enriched data sample
• Z/γ* Normalised in Z mass
• Top b-‐tagging efficiency measured in top control region in data
July
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Kinematics at Final Selection
68
0-‐jet ee/eμ/μμ
1-‐jet ee/eμ/μμ
One step before the final selection (no cuts on Δφ(ll) and m(ll))
Final selection on m(ll) (all other selection applied) cut cut
cut cut
July
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AB
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ATIO
N
Higgs mass [GeV]
SM!/!95
% C
L lim
it on
-110
1
10
210
100 200 300 400 500 600
CMS Preliminary" 2l2# WW #H
(7 TeV)-1 (8 TeV) + 4.9 fb-1L = 5.1 fb
median expected! 1± expected ! 2± expected
observed
§ Combined limits from 2011 and 2012 § 7 TeV result using a multivariate discriminant and
updated with the final luminosity measurement § 2012→ 5% improvement in sensitivity coming from
new object definitions and selection optimized for 2012 condition
Combination of 7 TeV + 8 TeV
Exclusion range expected: 123-‐450 GeV observed:129-‐520 GeV
69
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OLL
AB
OR
ATIO
N
Higgs mass [GeV]
SM!/!95
% C
L lim
it on
-110
1
10
210
100 200 300 400 500 600
CMS Preliminary" 2l2# WW #H
(7 TeV)-1 (8 TeV) + 4.9 fb-1L = 5.1 fb
median expected! 1± expected ! 2± expected
observed
Higgs mass [GeV]
SM!/!95
% C
L lim
it on
-110
1
10
210
100 200 300 400 500 600
CMS Preliminary" 2l2# WW #H
(7 TeV)-1 (8 TeV) + 4.9 fb-1L = 5.1 fb
median expected! 1± expected ! 2± expected
observed
§ Combined limits from 2011 and 2012 § 7 TeV result using a multivariate discriminant and
updated with the final luminosity measurement § 2012→ 5% improvement in sensitivity coming from
new object definitions and selection optimized for 2012 condition
Combination of 7 TeV + 8 TeV
Exclusion range expected: 123-‐450 GeV observed:129-‐520 GeV
70
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CM
S C
OLL
AB
OR
ATIO
N
8 TeV – injected SM Higgs signal
71
§ Signal injection using prediction at 5.1/m 8 TeV § Average background prediction § Signal injection for mH = 125 GeV with toys
July
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OLL
AB
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ATIO
N
8 TeV – injected SM Higgs signal
72
§ Signal injection using prediction at 5.1/m 8 TeV § Average background prediction § Signal injection for mH = 125 GeV with toys
VH Vbb Vlν,ll,νν!
73
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S C
OLL
AB
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ATIO
N
§ Characteristics and importance § By far, largest BR for mH<130 GeV § Key piece of the observation puzzle Tests specific production & decay couplings
§ But σbb(QCD) ~ 107 σxBR(H-‐> bb)!
VH èVbb, Vèlν, ll, νν
⇒ Search in associated production with W or Z
74
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OLL
AB
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ATIO
N
Analysis Strategy
Less reducible: V+bb, ZZ(bb), WZ(bb)
Reducible Backgrounds: QCD, top, W/Z+ light jets
5 channels Ø Z(ll)H(bb) Ø Z(νν)H(bb) Ø W(lν)H(bb)
Associated Production => final states with leptons, MET and b-‐jets
[GeV]Z
pt0 50 100 150 200 250
Even
ts/ 1
0 G
eV
0.02
0.04
0.06
0.08
0.1
0.12
0.14
0.16
0.18
0.2VH(125)
VVZ + bbZ + udscg
Single Top
tt
CMS Simulation = 7 TeVs
)b)H(bµµZ(
Boosted vector bosons: pT(V), 2 b-‐tagged jets (H-‐>bb) Back-‐to-‐back V and H, reconstruct mbb Main backgrounds estimated from data in control regions
75
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ATIO
N
§ First CMS VHbb 2011 analysis: Phys. Lett. B 710(2012) 284-‐306 § Here 5 m-‐1 @ 7 TeV (2011) + 5 m-‐1 @ 8 TeV (2012)
§ Improvements OF ~ 50% in sensitivity: § Two Pt(V) bins: “low” and “high” – see backup § Fit the shape of the MVA output distribution (vs cut and count) § Improved b-‐jet energy resolution [MVA regression]
Event selection
µ
ZH-‐>µµbb candidate
µ
Mbb = 128 GeV pT(bb)= 181 GeV
b b
[GeV]bbM60 80 100 120 140 160 180 200
Even
ts /
2.0
0
0.05
0.1
0.15
0.2
0.25
0.3Nominal RegressionCMS Simulation
-1 = 7 TeV, L = 5.0 fbs = 125 GeV)
H) (mb)H(b+l-Z(l
76
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BDT output-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1
Even
ts /
0.2
-110
1
10
210
310
410DataVH(125 GeV)VH(125 GeV)
bZ + bZ + udscgtt
Single topVVMC uncert. (stat.)
CMS Preliminary-1 = 7 TeV, L = 5.0 fbs
)b)H(b+e-Z(e
BDT output-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1
Dat
a/M
C
0.51
1.52 = 0.948s = 1.058 K2
νχ
-1 -0.8 -0.6 -0.4 -0.2 0 0.2
Even
ts/ 0
.1
-110
1
10
210
310
410
DataVH(125)VVW + bbW + udscgZ + bbZ + udscgSingle Toptt
QCDMC uncertainty
CMS Preliminary-1 = 8 TeV, L = 5.0 fbs
)b)H(bννZ(
BDT-1 -0.8 -0.6 -0.4 -0.2 0 0.2
Dat
a/M
C
0.51
1.52 MC uncert. (stat.) MC uncert. (stat.+sys.) = 0.995s = 1.144, K2
νχ
BDT output-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6
Even
ts/0
.04
-110
1
10
210
310
410DataWH(125)VVW + bbW + udscgZ + bbZ + udscgSingle Toptt
QCDMC uncert. (stat.)
CMS Preliminary-1 = 8 TeV, L = 5.1 fbs
)b)H(bνµW(
BDT output-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6
Data
/MC
1
2
3 MC uncert. (stat.) MC uncert. (stat.+sys.) = 0.985s = 0.458, K2νχ
Results Examples of final MVA distributions
W(µν)H(bb) 8 TeV
Z(ee)H(bb) 7 TeV
Z(νν)H(bb) 8 TeV
Higgs boson mass [GeV]110 115 120 125 130 135
SM/
95%
CL
Lim
it on
1
2
3
4
5
6
ObservedSCL ExpectedSCL
1 ± Expected SCL 2 ± Expected SCL
CMS Preliminary-1 = 7 + 8 TeV, L = 5.0 + 5.1 fbs
VH(bb), combined
• Observed limits: • Compatible with either
background or signal from a 125 GeV Higgs
77
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Characterization of excess near 125 GeV
adding high sensitivity, but low mass resolution WW
comb. significance: 5.1 σ expected significance for SM Higgs: 5.2 σ
78
H ττ μτh, eτh, eμ, μμ!
79
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AB
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§ Characteristics § High σ�BR at low mass § Sensitive to all production modes § Probes coupling to leptons § Enhanced σ x BR in MSSM § Challenging large backgrounds: DY→ττ, W+Jets, QCD
H→ττ
Excluded 99% CL
CMS 2011
80
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AB
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ATIO
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Analysis Strategy
§ Search performed in 4 tau-‐pair final states: μτh, eτh, eμ, μμ § Analysis divided into 5 categories: mass resolution, S/B § All categories are fit simultaneously
0 Jet, Low pT High background
1 Jet, Low pT Enhancement
from jet requirement
0 Jet, High pT Lepton pT spectrum
harder from H
1 Jet, High pT Enhancement from pT and jet requirement
VBF 2 jets, no jets in rapidity gap MVA based selection
Jets pT > 30 GeV
τh or μ pT1
1categorization based on τh pT for μτh, eτh ; μ pT for eμ; leading μ pT for μμ 81
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82
Full m(ττ) Reconstruction § SVFit § Event-‐by-‐event estimator of true m(ττ) likelihood Matrix Element used for τ→lνν Phase-‐Space is used for τ→π Nuisance parameters are integrated out
§ Mass peaks at true value § 20 % improved resolution With respect to 2011
§ Better separation of H from Z
[GeV]m0 50 100 150 200 250 300
Nor
mal
ized
/5 G
eV
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14 CMS Simulation 2012
(120) (integration) h
Higgs m
Z (integration)
hµ
L= ×
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AB
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ATIO
N
=125 GeVH
m) H×(5
observedZ
ttelectroweakQCD
[GeV]m0 100 200 300
[1/G
eV]
dN/d
m
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0CMS -1 = 7-8 TeV, L = 10 fbs2011+2012, hµ
=125H
m) H×(5observedZelectroweaktt
QCD
[GeV]m0 100 200 300
[1/G
eV]
dN/d
m
0
10
20
30
40
50
60
70
80 CMS -1 = 7-8 TeV, L = 10 fbs2011+2012, he=125
H m) H×(5
observedZ
eeZelectroweaktt
QCD
Mass Distributions in Event Categories
[GeV]m0 100 200 300
[1/G
eV]
dN/d
m
1
10
210
310CMS -1 = 7-8 TeV, L = 10 fbs2011+2012, µe
=125H
m) H×(5observedZelectroweaktt
QCD
eμ
§ Constrains energy scales and efficiencies § Large Drell-‐Yan
background § Sensitivity boosted
by low/high pT split
eτh
§ Enhanced sensitivity to VBF production § Highest sensitivity
for mH < 130 GeV
§ Enhanced sensitivity to gluon fusion § Improved mass
resolution § Increased sensitivity
by splitting into low and high pT categories
0 Jet
1 Jet
VBF
μτh
83
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§ ~2x improvement in sensitivity in 2011 data alone § => 70% improvement in sensitivity on the same data § 40% improvement with the additional luminosity
§ No significant departure from SM background-‐only expectation § Observed limit of 1.06 x SM at mH = 125 GeV
Results for H→ττ
[GeV]Hm110 120 130 140
SM/
95%
CL
limit
on
0
2
4
6
8
10
12
14CMS = 7+8 TeV, Hs,
Expected Limit)-1HIG-11-020 (1.6 fb)-1HIG-11-029 (4.9 fb)-1HIG-12-018 (10 fb
84
[GeV]Hm110 120 130 140
SM!/!95
% C
L lim
it on
0.00.51.01.52.02.53.03.54.04.55.0 CMS -1, L = 10 fb""# = 7+8 TeV, Hs,
simuation (signal inj.)observedexpected
expected! 1± expected! 2±
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ATIO
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§ ~2x improvement in sensitivity in 2011 data alone § => 70% improvement in sensitivity on the same data § 40% improvement with the additional luminosity
§ No significant departure from SM background-‐only expectation § Observed limit of 1.06 x SM at mH = 125 GeV
Results for H→ττ
[GeV]Hm110 120 130 140
SM/
95%
CL
limit
on
0
2
4
6
8
10
12
14CMS = 7+8 TeV, Hs,
Expected Limit)-1HIG-11-020 (1.6 fb)-1HIG-11-029 (4.9 fb)-1HIG-12-018 (10 fb
85
[GeV]Hm110 120 130 140
SM!/!95
% C
L lim
it on
0.00.51.01.52.02.53.03.54.04.55.0 CMS -1, L = 10 fb""# = 7+8 TeV, Hs,
simuation (signal inj.)observedexpected
expected! 1± expected! 2±
[GeV]Hm110 120 130 140
SM!/!95
% C
L lim
it on
0.00.51.01.52.02.53.03.54.04.55.0 CMS -1, L = 10 fb""# = 7+8 TeV, Hs,
simuation (signal inj.)observedexpected
expected! 1± expected! 2±
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S C
OLL
AB
OR
ATIO
N
§ ~2x improvement in sensitivity in 2011 data alone § => 70% improvement in sensitivity on the same data § 40% improvement with the additional luminosity
§ No significant departure from SM background-‐only expectation § Observed limit of 1.06 x SM at mH = 125 GeV
Results for H→ττ
[GeV]Hm110 120 130 140
SM/
95%
CL
limit
on
0
2
4
6
8
10
12
14CMS = 7+8 TeV, Hs,
Expected Limit)-1HIG-11-020 (1.6 fb)-1HIG-11-029 (4.9 fb)-1HIG-12-018 (10 fb
86
[GeV]Hm110 120 130 140
SM!/!95
% C
L lim
it on
0.00.51.01.52.02.53.03.54.04.55.0 CMS -1, L = 10 fb""# = 7+8 TeV, Hs,
simuation (signal inj.)observedexpected
expected! 1± expected! 2±
[GeV]Hm110 120 130 140
SM!/!95
% C
L lim
it on
0.00.51.01.52.02.53.03.54.04.55.0 CMS -1, L = 10 fb""# = 7+8 TeV, Hs,
simuation (signal inj.)observedexpected
expected! 1± expected! 2±
[GeV]Hm110 120 130 140
SM!/!95
% C
L lim
it on
0.00.51.01.52.02.53.03.54.04.55.0 CMS -1, L = 10 fb""# = 7+8 TeV, Hs,
simuation (signal inj.)observedexpected
expected! 1± expected! 2±
125 GeV
Full result
87
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OLL
AB
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ATIO
N
SM Higgs exclusion: confidence level
Expected in absence of SM Higgs boson: 110 – 600 GeV at 95% CL 110 – 580 GeV at 99% CL 110 – 520 GeV at 99.9% CL
88
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OLL
AB
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ATIO
N
SM Higgs exclusion: confidence level
Observed: 110 – 122.5 [...] 127 – 600 GeV at 95% CL 110—112 .. 113 – 121.5 [...] 128 – 600 GeV at 99% CL
89
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OLL
AB
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ATIO
N
SM Higgs exclusion: signal strength
Observed: 110 – 122.5 .... 127 – 600 GeV at 95% CL
90
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OLL
AB
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ATIO
N
Characterization of excess near 125 GeV
91
§ high sensitivity, high mass resolution channels: γγ+4l
§ γγ: 4.1 σ excess § 4 leptons: 3.2 σ excess § near the same mass 125 GeV
§ comb. significance: 5.0 σ
§ expected significance for SM Higgs: 4.7 σ
July
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Inca
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r the
CM
S C
OLL
AB
OR
ATIO
N
Characterization of excess near 125 GeV
adding high sensitivity, but low mass resolution WW
comb. significance: 5.1 σ expected significance for SM Higgs: 5.2 σ
92
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OLL
AB
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ATIO
N
Characterization of excess near 125 GeV
93
§ all channels together: comb. significance: 4.9 σ
§ expected significance for SM Higgs: 5.9 σ
July
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OLL
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ATIO
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Characterization of excess near 125 GeV
94
§ Observed significance: 4.9 σ
§ Excess seen in both § 7 TeV data (3.0 σ) § 8 TeV data (3.8 σ) § near the same mass 125 GeV
July
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OLL
AB
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ATIO
N
§ Likelihood scan for mass and signal strength in three high mass resolution channels
§ results are self-‐consistent and can be combined
Characterization of the excess: mass
95
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CM
S C
OLL
AB
OR
ATIO
N
§ To reduce model dependence, allow for free cross sections in three channels and fit for the common mass:
mX = 125.3 ± 0.6 GeV
Characterization of the excess: mass
96
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S C
OLL
AB
OR
ATIO
N
§ We have observed a state decaying to di-‐photon and four-‐lepton final state with statistical significance of 5 σ
§ The observed state has mass near 125.3 ± 0.6 GeV
§ Next we look at the extent to which the observed state is compatible, within the current uncertainties, with the SM Higgs boson
97
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CM
S C
OLL
AB
OR
ATIO
N
Compatibility with SM Higgs boson Signal strength
§ Overall best-fit signal strength in the combination: σ/σSM = 0.80±0.22
§ Signal strength in 7 and 8 TeV data are self-consistent
98
98
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OLL
AB
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ATIO
N
§ Event yields in different production times decay modes are self-‐consistent § albeit many modes have not yet reached sensitivity to distinguish SM from Background
99
Compatibility with SM Higgs boson event yields in different modes (1)
99
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S C
OLL
AB
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ATIO
N
Compatibility with SM Higgs boson event yields in different modes (2)
§ Event yields in different decay modes are self-‐consistent § Event yields in different production topologies are self-‐consistent
100
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OLL
AB
OR
ATIO
N
Compatibility with SM Higgs boson custodial symmetry
§ The measurement of the HàWW/Hà ZZ ratio is mostly driven by the ratio of the Higgs couplings to WW and ZZ, which is protected by custodial symmetry
§ Combination of “inclusive” WW and ZZ yields gives
R WW/ZZ = 0.9 +1.1 -0.6
July
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S C
OLL
AB
OR
ATIO
N
Fit to CV and CF Group the Higgs couplings into “Vectorial” and “Fermionic” sets. Attach a modifier to the SM prediction to each of those (CV and CF). Use LO theoretical prediction for loop-‐induced H → γγ, H → gg couplings. In agreement with the SM within the 95% confidence range
à Need more data!
solid contour: 68% CL dashed contour: 95% CL
July
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AB
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N
In summary
103
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In summary
104
[GeV]4lm
Even
ts /
3 G
eV
0
2
4
6
8
10
12
[GeV]4lm
Even
ts /
3 G
eV
0
2
4
6
8
10
12 Data
Z+X
*,ZZZ
=126 GeVHm
µ, 2e2µ7 TeV 4e, 4µ, 2e2µ8 TeV 4e, 4
CMS Preliminary -1 = 8 TeV, L = 5.26 fbs ; -1 = 7 TeV, L = 5.05 fbs
[GeV]4lm80 100 120 140 160 180
July
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AB
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ATIO
N
In summary
105
[GeV]4lm
Even
ts /
3 G
eV
0
2
4
6
8
10
12
[GeV]4lm
Even
ts /
3 G
eV
0
2
4
6
8
10
12 Data
Z+X
*,ZZZ
=126 GeVHm
µ, 2e2µ7 TeV 4e, 4µ, 2e2µ8 TeV 4e, 4
CMS Preliminary -1 = 8 TeV, L = 5.26 fbs ; -1 = 7 TeV, L = 5.05 fbs
[GeV]4lm80 100 120 140 160 180
July
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OLL
AB
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ATIO
N
In summary
[GeV]4lm
Even
ts /
3 G
eV
0
2
4
6
8
10
12
[GeV]4lm
Even
ts /
3 G
eV
0
2
4
6
8
10
12 Data
Z+X
*,ZZZ
=126 GeVHm
µ, 2e2µ7 TeV 4e, 4µ, 2e2µ8 TeV 4e, 4
CMS Preliminary -1 = 8 TeV, L = 5.26 fbs ; -1 = 7 TeV, L = 5.05 fbs
[GeV]4lm80 100 120 140 160 180
May
18, 201
2 Bou
lder Colorad
o
J. In
cand
ela UCS
B/CE
RN
In summary
107
We have observed a new boson with a mass of
125.3 ± 0.6 GeV at
4.9 σ significance !
Acknowledgements
108
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§ A very wide range of measurements have shown that SM predictions for known physics have been ~spot on. § A tribute to a large amount of work done by our theory colleagues along with the results from the other collider experiments at LEP, Tevatron, HERA, b-‐factories etc.
§ And the Higgs cross section WG and all those theorists who prepared the way for today!
Acknowledgements
Electroweak Theory
Electroweak Symmetry Breaking
109
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July
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ATIO
N
First (single) beams circulating in the machine!
10 September 2008: LHC inauguration day
110"
Six CERN DGs, from conception to physics:"Schopper, Rubbia, Llewellyn Smith, Maiani, Aymar, Heuer"(from right to left) with 5-year terms!!"
110
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§ The LHC Project (the accelerator, the experiments, and computing) have required a long and painstaking effort on a global scale encompassing the terms of 6 Director Generals, 3 LHC Project Leaders, and 6 Research Directors.
§ The Project started in earnest in 1987 with Rubbia’s Long Range Planning Committee recommending the LHC as the right choice for CERN’s future.
§ Great appreciation of the work of teams that built and now operate the magnificent LHC accelerator
§ The CMS experiment is a tribute to the vision of its founders, the dedication of all of its thousands of collaborators in constructing and preparing the experiment in terms of hardware, software, computing, and physics analysis, and now the ones who operate and analyze the data (mostly young scientists!).
Acknowledgements
111
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March 30 2010: 1st Collisions at 7 TeV"
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July
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A small fraction of the CMS Collaboration: June 2012"
113
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July
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AB
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Thanks to all of the CMS institutes"AACHEN-1, AACHEN-3A, AACHEN-3B, ADANA-CUKUROVA, ALABAMA-UNIV, ANKARA-METU, ANTWERPEN, ATHENS, ATOMKI, AUCKLAND, BARI, BAYLOR-UNIV, BEIJING-IHEP, BOGAZICI, BOLOGNA, BOSTON-UNIV, BRISTOL, BROWN-UNIV, BRUNEL, BRUSSEL-VUB, BRUXELLES-ULB, BUDAPEST, CALTECH, CANTERBURY, CARNEGIE-MELLON, CATANIA, CCCS-UWE,CERN, CHANDIGARH, CHARLES-UNIV, CHEJU, CHICAGO, CHONNAM, CHUNGBUK, CHUNGLI-NCU, COLORADO, CORNELL, DEBRECEN-IEP, DELHI-UNIV, DEMOKRITOS, DESY, DONGSHIN, DUBLIN-UCD, DUBNA, EINDHOVEN, FAIRFIELD, FERMILAB, FIRENZE, FLORIDA-FIU, FLORIDA-STATE, FLORIDA-TECH, FLORIDA-UNIV, FRASCATI, GENOVA, GHENT, HAMBURG-UNIV, HEFEI-USTC, HELSINKI-HIP, HELSINKI-UNIV, HEPHY, IOANNINA, IOWA, IPM, ISLAMABAD-NCP, ISTANBUL-TECH, JOHNS-HOPKINS, KANGWON, KANSAS-STATE, KANSAS-UNIV, KARLSRUHE-IEKP, KHARKOV-ISC, KHARKOV-KIPT, KHARKOV-KSU, KONKUK-UNIV, KOREA-UNIV, KYUNGPOOK, LAPP, LAPPEENRANTA-LUT, LIP, LIVERMORE, LONDON-IC, LOUVAIN, LYON, LYON-CC, MADRID-CIEMAT, MADRID-UNIV, MARYLAND, MEXICO-IBEROAM, MEXICO-IPN, MEXICO-PUEBLA, MEXICO-UASLP, MILANO-BICOCCA, MINNESOTA, MINSK-INP, MINSK-NCPHEP, MINSK-RIAPP, MINSK-UNIV, MISSISSIPPI, MIT, MONS, MOSCOW-INR, MOSCOW-ITEP, MOSCOW-LEBEDEV, MOSCOW-MSU, MOSCOW-RDIPE, MUMBAI-BARC, MYASISHCHEV, NAPOLI, NEBRASKA, NICOSIA-UNIV, NORTHEASTERN, NORTHWESTERN, NOTRE DAME, NUST, OHIO-STATE, OVIEDO, PADOVA, PAVIA, PEKING-UNIV, PERUGIA, PISA, POLYTECHNIQUE, PRINCETON, PROTVINO, PSI, PUERTO RICO, PURDUE, PURDUE-CALUMET, RAL, RICE, RIE, RIO-CBPF, RIO-UERJ, ROCHESTER, ROCKEFELLER, ROMA-1, RUTGERS, SACLAY, SANTANDER, SAO PAULO, SEONAM, SEOUL-EDU, SEOUL-SNU, SINP, SHANGHAI-IC, SKK-UNIV, SOFIA-INRNE, SOFIA-ISER, SOFIA-UNIV, SPLIT-FESB, SPLIT-UNIV, ST-PETERSBURG, STRASBOURG, SUNY-BUFFALO, TAIPEI-NTU, TALLINN, TASHKENT, TBILISI-IHEPI, TBILISI-IPAS, TENNESSEE, TEXAS-TAMU, TEXAS-TECH, TIFR-EHEP, TIFR-HECR, TORINO, TRIESTE, UCDAVIS, UCLA, UCRIVERSIDE, UCSB, UCSD, UNIANDES, VANDERBILT, VILNIUS-ACADEMY, VILNIUS-UNIV, VINCA, VIRGINIA-TECH, VIRGINIA-UNIV, WARSAW-IEP, WARSAW-INS, WARSAW-ISE, WAYNE, WISCONSIN, WONKWANG, YEREVAN, ZAGREB-RUDJER, ZURICH-ETH, ZURICH-UNIV
June 2012: 193 Institutions with ~3300 scientists and engineers ~ 2000 Signing Authors (including students) 114
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HUGE Thanks to CERN Staff and CMS Funding Agencies"
We congratulate our colleagues in the CERN accelerator departments for the excellent performance of the LHC machine. We thank the technical and administrative staff at CERN and other CMS institutes, and acknowledge support from: BMWF and FWF (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, and FAPESP (Brazil); MES (Bulgaria); CERN; CAS, MoST and NSFC (China); COLCIENCIAS (Colombia); MSES (Croatia); RPF (Cyprus); MoER; SF0690030s09 and ERDF (Estonia); Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRT (Greece); OTKA and NKTH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); NRF and WCU (Korea); LAS (Lithuania); CINVESTAV, CONACYT, SEP, and UASLP-FAI (Mexico); MSI (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan); MON, RosAtom, RAS and RFBR (Russia); MSTD (Serbia); SEIDI and CPAN (Spain); Swiss Funding Agencies (Switzerland); NSC (Taipei); TUBITAK and TAEK (Turkey); STFC (United Kingdom); DOE and NSF (USA). Individuals have received support from the Marie-Curie programme and the European Research Council (European Union); the Leventis Foundation; the A. P. Sloan Foundation; the Alexander von Humboldt Foundation; the Austrian Science Fund (FWF); the Belgian Federal Science Policy Office; the Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium); the Council of Science and Industrial Research, India; the Compagnia di San Paolo (Torino); Centro Siciliano di Fisica Nucleare e struttura della materia, ‘Teller Fellowship and LDRD’ ,and the HOMING PLUS programme of Foundation for Polish Science, cofinanced from European Union, Regional Development Fund.
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Stay tuned
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